CNC Machining High Strength Steel Spline Shaft for Sewing Machine Parts. Extensive Material Options: Supports Carbon Steel, Alloy Steel, Stainless Steel, Aluminum, Brass, and more. High Precision Tolerances: Diameter tolerance 0.002mm, Roundness 0.0005mm, Straightness 0.005mm. Custom Surface Treatment: Offers Plating, Anodizing, Black Coating, and other specialized finishes. Versatile Heat Treatment: Includes Oil Quenching, High Frequency, Carburization, and Vacuum treatments. OEM and ODM Services: Full customization available for logo, design, and specific product requirements. Rapid Response Support: Technical response within one hour; quotation within 12 working hours. Global Export Experience: Serving over 30 countries with suppliers for major international brands. Quality Warranty Coverage: 6-month quality warranty with 99.9% quality satisfaction guarantee.